remove dev.cc file, left over from merge of the dev.cc branch.

Change-Id: I6021f42ce4ac6a66632751b21ab13e9b22383af9
Reviewed-on: https://go-review.googlesource.com/1172Reviewed-by: Minux Ma <minux@golang.org>
Reviewed-by: Andrew Gerrand <adg@golang.org>